Sawmill-carriage.



0. G. BONN. I

SAWMILL CARRIAGE.

APPLICATION FILED JUNE 7,1905.

PATENTED JAN. 16,

vwanroz CLYDE G. BONN, OF PINE BLUFF, ARKANSAS.

SAWMILL-CARRIAGE.

Specification of Letters Patent.

Patented Jan. 16, 1906.

Application filed June 7,1905. Serial No. 264,186.

To all whom it may concern.-

Be it known that I, CLYDE G. BoNN, a citizen of the United States ofAmerica, residing at Pine Blufl, in the county of Jefferson and State ofArkansas, have invented new and useful Improvements inSawmill-Carriages, of which the following is a specification.

This invention relates generally to improvements in sawmill-carriages,and more particularly to feeding and cushioning means therefor, one ofthe objects of the invention being to provide simple and efiectivemechanism applicable to carriages in common use for feeding the sametoward and from the saw by the direct action of a piston operated bysteam or other fluid motive power in such manner as to provide for anefiective cushioning of the carriage when the motion of the same issuddenly reversed or when the carriage is brought from a state of motionto one of rest.

Another object of the invention is to provide cushioning mechanism whichis simple of construction, effective in use, and comparativelyinexpensive of manufacture and application and which is adapted to bereadily and conveniently adjusted to regulate the cushioning actionthereof.

The preferred embodiment of the invention is illustrated in theaccompanying drawings, in which- Figure 1 is a side elevation of theinvention as applied in use to a sawmill-carriage. Fig. 2 is alongitudinal section through the carriage on an enlarged scale. Fig. 3is a rear end elevation of the carriage, and Fig. 4 is a cross-sectiontaken on the plane indicated by the line 4 4 of Fig. 2.

Referring now more particularly to the drawings, the numeral 1represents a sawmillcarriage of the ordinary or any approvedconstruction, the same being provided with wheels 2 to run upon guidebars or rails 3.

In accordance with my invention I provide a bracket plate or frame 4,adapted to be mounted upon the under side of the carriage and to befastened thereto by any suitable securing means, as through the mediumof bolts 5. This bracket plate is provided at its front and rear endswith depending flanges or hangers 6 and 7, apertured for the receptionof a guide rod or bolt 8, extending longitudinally beneath the carriageand in the center line thereof. Slidably mounted upon this rod or boltis a head 9, having a central passage through which the rod or boltextends and which is in the form of an encompassing sleeve. At itsforward end the head 9 is provided with a flange or enlargement 10,having an upper straight edge 11 to bear against the under side of theplate 4 and hold the head from rotation while permitting it to havesliding movement on the guide rod. Adjacent to the flange the head isalso pro vided with depending cars 12, to which is attached one end of apiston-rod 13, the other end of said rod being connected with a piston(not shown) arranged to operate within a power-cylinder 14. Connectedwith the cylinder 14 is a chest 15, to which leads a supply-pipe 16,through which the fluid-impelling means, such as air orsteam, isconducted thereto from a suitable source I of supply. From the chestlead pipes 17 and 18 to conduct the impelling medium to opposite ends ofthe cylinder, and in practice suitable valve mechanism is provided tocontrol the feed of the steam to effect the reciprocation of the pistonWithin the cylinder to feed the sawmill-carriage backward and forward,as will be readily understood.

In order to operatively connect the head 9 with the carriage and securea cushioning action to prevent injury to the carriage and operatingmechanism when the motion of the carriage is suddenly reversed or whenthe carriage is brought from a state of motion to one of rest,cushioning-springs generically denoted 19 and 20 and preferably, thoughnot necessarily, arranged in pairs are employed and arranged about theguide-rod 8 in front and in rear of the said head, the springs 19 beingarranged to abut at one end against the flange 6 and at the other endagainst the flange 10 of the head, while the springs 20 are arranged toabut at one end against the rear end of the head and at its opposite endagainst a pressure-regulating plate 21, arranged adjacent to and inadvance of the flange 7, the latter carrying set-screws 22, whereby theplate may be adjusted to directly regulate the pressure of the springs20 and indirectly therethrough regulate the travel of the head 9 and thepressure of the springs 19. Each pair of springs 19 and 20 is composedof inner and outer spring-coils 19 19 and 20 20 respectively, ofdifferent diameters and arranged one within the other, as shown.

In the operation of the device the piston 13 on its outstrokecommunicates motion to the head 9 which is permitted to yield rearwardlyby the springs 20 to a slight extent to prevent jarring of the carriage,the motion of the head being communicated by said spring to thecarriage, which is thereby moved in one direction. Upon the instroke ofthe piston motion in the reverse direction is similarly imparted to thehead 9, whose movement is resisted and limited by the springs 19, whichwill transmit the motion to the carriage, thus moving the latter in theopposite direction. It will thus be seen that in both directions ofmotion the direct thrust of the piston will be transmitted to the headand the springs will yield sufficiently to prevent sudden jar or strainresulting therefrom being transmitted to the carriage, and it will alsobe seen that the arrangement of the pairs of springs is such as tocushion the shock when the carriage is suddenly reversed or brought to acomplete stop, thus obviating liability of damage to the carriage oroperating parts. The resistance of the springs may be regulatedaccording to the weight of the carriage and the load through theadjustment of the regulating-plate 21 by the set-screws 22.

The construction of the device is advantageous in that it is not onlyapplicable to new carriages, but to carriages already in use and in thatit may be manufactured and applied at a comparatively low cost.

Having thus described the invention, what is claimed as new'is- Thecombination with a sawmill-carriage, of a supporting-bracket appliedthereto and having downwardly-projecting terminal flanges, a guide-rodsupported by said flanges, a head slidably mounted on the guide-rod andprovided with an angular face to engage the bracket to hold said headfrom rotation, a regulating-plate on the guide-rod adjacent to one ofsaid flanges, springs upon the guiderod between the head and the otherflange and the head and regulating-plate, means for imparting motion tothe head to reciprocate the carriage, and means for adjustlng theregulating-plate, the construction being such that the parts of thedevice are supported by said bracket, whereby the device is adapted forattachment to any ordinary sawmill-carria e.

fn testimony whereof I affix my signatur in presence of two witnesses.

CLYDE G. BONN.

